Sure.
The image(s) have to have a url. i.e., they have to be somewars on the Intarwebs with an http address. (Try tiny pic if you're going to upload images that aren't on the webby.
Then you post them using either the picture tool, or roll your own using [ im g] http://urlofmypicturething. c o m[ / im g] but deleting the spaces and putting the linky thingy between the [ ] img brackets [ / ] . Again, lose the spaces.
It ain't rocket surgery.